(gdb) bt
#0  0xfffffffff6a40400 in ?? ()
#1  0x00000000005aba08 in php_dl ()
#2  0x000000000061f8f6 in php_load_function_extension_cb ()
#3  0x00000000006538dc in zend_llist_apply ()
#4  0x000000000061f8c8 in php_ini_register_extensions ()
#5  0x000000000061a4dd in php_module_startup ()
#6  0x00000000006e553d in main ()